using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string cpf = '"'+"    020.075..460-27    "+'"';

        Regex cpf1 = new Regex(@"\b[0-9]{3}[.-]*[0-9]{3}[.-]*[0-9]{3}[.-]*[0-9]{2}\b");

        Console.WriteLine(cpf1.Replace(cpf, "*"));

        Regex cpf2 = new Regex(@"["+'"'+@"]\s*[0-9]{3}[.-]*[0-9]{3}[.-]*[0-9]{3}[.-]*[0-9]{2}\s*["+'"'+@"]");

        Console.WriteLine(cpf2.Replace(cpf, "*"));

        Console.WriteLine(new Regex(@"\b[456]\d{3}(\s*\d{4}){3}\s*\d{0,3}\b").Replace("6205500000000000", "*"));

    }

}